Luminaire



FIG. 1 is a perspective view of a luminaire showing the design;

FIG. 2 is a side view thereof;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof.

The broken lines showing environmental structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a luminaire, as shown and described. 